ID help-but no picture:S

michelle

Reefing newb
okay, so i have discovered about 30 little "things" on my rock. I will try to describe them well because I can't get a picture of them, and "things" is rather vague:)
You know on the devils hand coral, the little tree like structures that come out? about 1/8 to 1/4 inch long? Them. Looks just like it. But they are on 3 seperate rocks.
What are they? Are they reef safe? do they spread quickly?
 
definately hydroids. I found a picture Identical on wetweb.
Stick_creature_id_WWM.jpg
 
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